Can't reboot (unmount problem) when opened web control panel and show dashboard or filesystems

Hi, I have weird problem. I have Raspberry Pi 64-bit installed on USB SSD. For "NAS" data I attached 2 USB drives (2.5 HDD and 3.5 HDD (BTRFS both) with external power supply). When I don't open Web Control Panel everything is ok, after sudo reboot command in SSH Pi reboots in few seconds, but when I open Web Control Panel and view Dashboard with drives status or just view filesystems in menu, after sudo reboot command it hangs on A stop job is running /srv/dev-disk-by-uuid ... after few minutes it turns into BTRFS: error (device sdc1) in write_all_supers:3878: errno=-5 IO failure(errors while submitting device barriers.). What can be wrong?